Can't get a good backup

I have yet to get a backup since installing the SBS version on a new install of SBS 2011. I get this error on any backup to external drive:

ProtectCommand: Failed to execute the command.
Additional info:
--------------------
Error code: 41
Module: 307
LineInfo: e6792a5ee190dda7
Fields: $module : agent_protection_addon_vs_32308
Message: ProtectCommand: Failed to execute the command.
--------------------
Error code: 11
Module: 300
LineInfo: 2a46340236902166
Fields: $module : mms_vs_32308
Message: Failed to connect to the process.
--------------------
Error code: 12
Module: 300
LineInfo: 2a46340236902167
Fields: $module : mms_vs_32308
Message: The operation has timed out.
--------------------

Any ideas?